import React, { Component } from 'react'
import store from '../../redux/store'
import {createIncrementAction, createDecrementAction, createIncrementAsyncAction} from '../../redux/count_action'

export default class Count extends Component {
  // 监听redux状态的变化
  // componentDidMount(){
  //   store.subscribe(()=>{
  //     this.setState({})
  //   })
  // }

	//加法
	increment = ()=>{
		const {value} = this.selectNumber
    store.dispatch(createIncrementAction(value*1))
	}
	//减法
	decrement = ()=>{
		const {value} = this.selectNumber
    store.dispatch(createDecrementAction(value*1))
	}
	//奇数再加
	incrementIfOdd = ()=>{
		const {value} = this.selectNumber
		if(store.getState() % 2 !== 0){
			store.dispatch(createIncrementAction(value*1))
		}
	}
	//异步加
	incrementAsync = ()=>{
		const {value} = this.selectNumber
		store.dispatch(createIncrementAsyncAction(value*1,500))
	}

	render() {
		return (
			<div>
				<h1>当前求和为：{store.getState()}</h1>
				<select ref={c => this.selectNumber = c}>
					<option value="1">1</option>
					<option value="2">2</option>
					<option value="3">3</option>
				</select>&nbsp;
				<button onClick={this.increment}>+</button>&nbsp;
				<button onClick={this.decrement}>-</button>&nbsp;
				<button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>&nbsp;
				<button onClick={this.incrementAsync}>异步加</button>&nbsp;
			</div>
		)
	}
}
